128383915 has 48 divisors (see below), whose sum is σ = 183816864. Its totient is φ = 85299200.

The previous prime is 128383909. The next prime is 128383943. The reversal of 128383915 is 519383821.

It is not a de Polignac number, because 128383915 - 2⁵ = 128383883 is a prime.

Its product of digits (51840) is a multiple of the sum of its prime factors (288).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 651597 + ... + 651793.

It is an arithmetic number, because the mean of its divisors is an integer number (3829518).

Almost surely, 2^128383915 is an apocalyptic number.

128383915 is a deficient number, since it is larger than the sum of its proper divisors (55432949).

128383915 is a wasteful number, since it uses less digits than its factorization.

128383915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 271 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 128383915 is about 11330.6626019841. The cubic root of 128383915 is about 504.4717739148.

The spelling of 128383915 in words is "one hundred twenty-eight million, three hundred eighty-three thousand, nine hundred fifteen".